[R] Error : Error in if (antipodal(p1, p2))

[shabsae]

Hey,

I'm trying to build something like this
http://flowingdata.com/2011/05/11/how-to-map-connections-with-great-circles/
but with my own data in csv files.
The code runs well if I use the same csv files as the author, but with mine
, this is what I get

*Code*

 library(maps)
library(geosphere)


map("world")

xlim <- c(-180.00, 180.00)

ylim <- c(-90.00, 90.00) 

map("world", col = "#f2f2f2", fill = TRUE, bg = "white", lwd = 0.05,xlim =
xlim, ylim = ylim)

airports <- read.csv("/Users/shabnam/Desktop/airports.csv", as.is=TRUE,
header=TRUE)
flights <- read.csv("/Users/shabnam/Desktop/flights.csv", as.is=TRUE,
header=TRUE)

 pal <- colorRampPalette(c("#545454", "white"))colors <- pal(100)
map("world", col="#303030", fill=TRUE, bg="black", lwd=0.05, xlim=xlim,
ylim=ylim)


fsub <- flights[flights$airline == "AA",]


fsub <- fsub[order(fsub$cnt),]

maxcnt <- max(fsub$cnt)

for (j in 1:length(fsub$airline)) 
{
air1 <- airports[airports$iata == fsub[j,]$airport1,]

air2 <- airports[airports$iata == fsub[j,]$airport2,]

inter <- gcIntermediate(c(air1[1,]$long, air1[1,]$lat), c(air2[1,]$long,
air2[1,]$lat), n=100, addStartEnd=TRUE)

colindex <- round( (fsub[j,]$cnt / maxcnt) * length(colors) )

lines(inter, col=colors[colindex], lwd=0.8)
}






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